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Updated: Feb 3, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
Published on: January 26, 2016
Molecular layers in thin supported films exhibit the same scaling as the bulk between slow relaxation and vibrational
Matteo Becchi1, Andrea Giuntoli, Dino Leporini
1Dipartimento di Fisica "E. Fermi", Università di Pisa, Largo B. Pontecorvo 3, Pisa, I-56127, Italy. dino.leporini@unipi.it.
Abstract:
We perform molecular-dynamics simulations of a supported molecular thin film. By varying thickness and temperature, we observe anisotropic mobility as well as strong gradients of both the vibrational motion and the structural relaxation through film layers with monomer-size thickness. We show that the gradients of the fast and the slow dynamics across the layers (except the adherent layer to the substrate) comply, without any adjustment, with the same scaling between the structural relaxation time and the Debye-Waller factor originally observed in the bulk [Larini et al., Nat. Phys., 2008, 4, 42]. The scaling is not observed if the average dynamics of the film is inspected. Our results suggest that the solidification process of each layer may be tracked by knowing solely the vibrational properties of the layer and the bulk.
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